Grade 6 Science Games
These 139 free science games for grade 6 let kids predict what will happen, watch it play out and see why. They cover forces & motion, simple machines, matter, electricity, light, sound, heat, earth & space, life science, human body, chemistry, energy, weather, ecosystems, space & astronomy, plant science, geology, cells & microbiology, health & the body, environment & climate, oceans & marine life, extreme weather & sky, space exploration, genetics & heredity, evolution & classification, making electricity, motion & forces, waves & vibrations, animal kingdom, light & optics, chemistry lab, body systems, plate tectonics, science skills and run in the browser with no sign-up and no ads.
Each game shows the grade band it is written for, so you can pick the ones that fit your child.
Forces & Motion
- Newton's CradleGrades 6–8Predict how many balls swing out when you release a few — momentum passes straight through.
- InertiaGrades 4–7Predict what a rider does when the bus stops suddenly — a moving body keeps moving.
- Pendulum SwingGrades 4–7Predict what changes a swing’s speed — only the length; weight and swing size do not.
- Air PressureGrades 4–6Predict what air pressure does — it pushes from all sides, holding water in and crushing cans.
- Force FieldGrades 6–8Cargo pods fall like Missile Command — fire the battery whose force stops each one (F = m × a, then braking from speed and time, then fighting gravity); too little lands, too much bounces back up.
Simple Machines
- Lever LabGrades 4–6Predict which side of the lever drops, or where to push for the least effort.
- Pulley LabGrades 5–7Predict the effort to lift a load with one, two or three pulleys — more pulleys, less force.
- Ramp RaiserGrades 5–7Predict the push needed up a steep versus a gentle ramp — a gentler slope trades force for distance.
- Gear TrainGrades 4–6Predict which way the last gear turns and which spins faster — meshed gears turn opposite ways.
Matter
- Float or Sink?Grades 4–6Predict whether an object floats or sinks — it is density, not size, that decides.
- Separating MixturesGrades 4–6Predict how to pull a mixture apart — a magnet, a filter or evaporation.
- Density LayersGrades 5–6Predict how liquids stack — the densest sinks to the bottom, the lightest floats on top.
- Density StackGrades 6–8Steer falling blocks into a tank of liquid layers — each sinks through lighter liquids and rests on the first denser one, so work out mass ÷ volume and fill a layer to clear it.
Electricity
- Bulb BrightnessGrades 4–6Add a bulb in series and predict — most guess brighter, but they all get dimmer.
- Series vs ParallelGrades 4–6One bulb burns out — predict which circuit keeps the others lit.
- Circuit LemmingsGrades 4–6Fill the gaps with wire and conductors and flip the switches so marching electrons get from − round to + and light the bulb — open gaps, insulators and shortcuts stop them.
Light
- Mirror BounceGrades 4–6Predict where a light ray goes after it hits a mirror — it bounces off at the same angle it arrived.
- The Bent StrawGrades 4–6Predict why a straw looks broken in water — light bends as it crosses between air and water.
- Splitting ColorsGrades 4–6Predict what a prism does to white light — it fans into a rainbow, because white is every color.
- Mirror BreakoutGrades 4–6Slide and tilt a mirror paddle so a light beam bounces into the bricks — angle in equals angle out, glass lets light through and black stops it.
Sound
Heat
Earth & Space
- Moon PhasesGrades 4–6Predict the Moon shape — phases come from the sunlight angle as it orbits, not a shadow.
- Why We Have SeasonsGrades 5–7Predict what makes summer hot — the tilt of the Earth, not its distance from the Sun.
- Volcanoes & EarthquakesGrades 4–7Predict what moving plates do — collide, pull apart or slip for mountains, volcanoes and quakes.
- Ocean TidesGrades 5–8Predict what causes tides — the Moon’s gravity pulls the ocean into a bulge Earth spins through.
Life Science
Human Body
- MusclesGrades 3–6Predict how a muscle moves you — muscles can only pull, never push, so they work in opposing pairs.
- DigestionGrades 3–6Predict food’s journey — mouth to stomach to intestines, where nutrients soak into the blood.
- Heart & BloodGrades 3–6Predict how blood moves — the heart pumps it around a loop, out with oxygen and back to refill.
- Brain & NervesGrades 3–6Predict how your body sends messages — the brain is in charge, with nerve signals to move and feel.
Chemistry
- Atoms & MoleculesGrades 4–7Predict what things are made of — tiny atoms that join into molecules, packed tight or flying free.
- Physical or Chemical?Grades 4–7Predict the change — reshaping the same stuff, or making a brand-new substance you can’t undo.
- SolubilityGrades 4–7Predict what dissolves and how much — some things don’t, and water fills up and saturates.
- Acids & BasesGrades 5–8Predict acid or base — sour reds and slippery greens, revealed by an indicator’s color.
- Chemical ReactionsGrades 5–8Predict if a reaction happened — fizzing gas, a color change, heat or a new solid are the clues.
- Mixtures vs CompoundsGrades 5–8Predict mixture or compound — jumbled and separable, or atoms bonded into something new.
- Element DefenseGrades 5–7Atoms march down like Space Invaders — fire each one's outer-shell electrons, its periodic group, or the ion it forms, while shielded noble gases need the 🛡 key.
- Reaction LabGrades 6–8Steer and turn falling atom capsules so each molecule gets exactly the atoms its formula needs — then balance real reactions like 2H₂ + O₂ → 2H₂O.
Energy
- Forms of EnergyGrades 3–6Predict the form — light, heat, sound, electrical, motion or chemical energy.
- Friction Makes HeatGrades 3–6Predict what rubbing does — friction turns motion into heat; rougher and faster makes more.
- Kinetic & PotentialGrades 4–7Predict the energy — stored up high or in a spring, or the energy of motion as it’s released.
- Energy TransformationsGrades 4–7Predict what energy becomes — a bulb turns electrical into light; your body turns food into motion.
- Renewable EnergyGrades 4–7Predict which sources last — sun, wind and water refill; coal, oil and gas run out.
- Energy Is Never LostGrades 5–8Predict where energy goes — it’s never destroyed; the "lost" bit became heat and sound.
Weather
- What Makes WindGrades 3–6Predict which way the wind blows — warm air rises and cooler air rushes in to take its place.
- Weather vs ClimateGrades 4–7Predict weather or climate — today’s sky versus the long-run average of a whole place.
- Humidity & DewGrades 4–7Predict when water appears — humid air that cools drops its water as dew, fog or beads on cold glass.
Ecosystems
- Food WebsGrades 4–7Predict the ripple — remove one species from a web and others rise or fall.
- DecomposersGrades 3–6Predict nature’s recyclers — fungi, worms and bacteria break down dead matter and feed the soil.
- Predator & PreyGrades 4–7Predict the cycle — more prey feeds more predators, which then eat the prey back down.
- Producers & ConsumersGrades 3–6Predict who makes food and who eats it — plants produce, animals consume, energy flows from the Sun.
Space & Astronomy
- EclipsesGrades 4–7Predict solar or lunar — line up the Sun, Moon and Earth and watch the shadow fall.
- ConstellationsGrades 3–6Predict the star pattern — connect the dots, and see which ones the seasons bring.
- Stars & GalaxiesGrades 4–7Predict what counts as a star — the Sun is one — then zoom out to a galaxy of billions.
- Gravity & OrbitsGrades 5–8Predict what holds a planet in orbit — gravity; cut it and the planet flies off straight.
- Weight in SpaceGrades 4–7Predict where you weigh less — your mass stays the same, but gravity changes your weight.
- Comets & AsteroidsGrades 3–6Predict rocky or icy — asteroids tumble in a belt; comets grow a tail near the Sun.
Plant Science
Geology
- Rock TypesGrades 3–6Predict the family — igneous from cooled magma, sedimentary from pressed layers, metamorphic from heat and pressure.
- The Rock CycleGrades 4–7Predict what a rock becomes — melt and cool, press, or heat it, and it changes type over time.
- Earth’s LayersGrades 4–7Predict the order inward — crust, mantle, liquid outer core, solid inner core, hotter toward the center.
- Minerals & RocksGrades 4–7Predict mineral or rock — a mineral is one pure substance; a rock is a mixture of mineral grains.
Cells & Microbiology
- What Is a Cell?Grades 3–6Predict what counts as living — all living things are built from tiny cells too small to see.
- Plant vs Animal CellsGrades 4–7Predict which cell — both share a nucleus, but only plant cells have a wall and chloroplasts.
- BacteriaGrades 3–6Predict helpful or harmful — tiny single-celled bacteria live everywhere and split to multiply.
- VirusesGrades 4–7Predict alive or not — a virus is tinier than bacteria and needs a host cell to copy itself.
- Single-Celled LifeGrades 4–7Predict one cell or many — an amoeba does everything to live inside a single cell.
Health & the Body
Environment & Climate
Oceans & Marine Life
- Ocean ZonesGrades 3–6Predict the zone — light fades and pressure grows from the sunlit top to the midnight deep.
- Ocean CurrentsGrades 4–7Predict warm or cold — wind and sinking water drive currents that carry heat around the globe.
- Marine Food WebsGrades 3–6Predict the ocean ripple — energy starts with plankton; remove one link and others shift.
- The Deep SeaGrades 3–6Predict the dark, cold, high-pressure deep — and the strange creatures adapted to survive it.
Extreme Weather & Sky
- HurricanesGrades 3–6Predict how a hurricane forms and spins — a giant storm with a calm eye over warm seas.
- TornadoesGrades 3–6Predict the funnel — a fast spinning column of air that drops from a thunderstorm.
- DroughtsGrades 3–6Predict the long dry spell — rivers drop and crops wilt when the rain stays away.
- Atmosphere LayersGrades 4–7Predict the layer — from the weather layer up through the ozone to where the ISS orbits.
Space Exploration
- SatellitesGrades 4–7Predict the job and the orbit — satellites fall around Earth while doing GPS, weather and TV.
- The Space StationGrades 3–6Predict life in orbit — everything floats because the station is always falling around Earth.
- Mars RoversGrades 3–6Predict a rover’s job — a robot drives, drills and tests Mars where it’s too risky for people.
- TelescopesGrades 3–6Predict what a telescope does — it gathers light so faint, faraway things look big and bright.
- Orbit RiderGrades 5–7Meteors knock your ship off its orbit — fire the thrust burst that matches the ring's orbit speed (closer rings are faster), or boost to climb and brake to drop, while real gravity shows why too slow falls in and too fast flies out.
Genetics & Heredity
- DNAGrades 4–7Predict what DNA is — the twisted-ladder code inside cells that tells a body how to grow.
- Dominant & RecessiveGrades 4–7Predict which trait shows — a dominant version wins unless two recessive copies meet.
- Genes & ChromosomesGrades 5–8Predict how they nest — a gene is part of a chromosome, bundled inside the cell’s nucleus.
- MutationsGrades 5–8Predict the effect — a change in the DNA code can be helpful, harmful, or make no difference.
- Trait VariationGrades 3–6Predict the variety — mixing two parents’ genes means no two offspring are exactly alike.
- Gene SquadronGrades 6–8Offspring ships dive out of a Punnett-square formation — line up under each one and fire the genotype or trait it gets from Mom's allele plus Dad's allele.
Evolution & Classification
- Natural SelectionGrades 4–7Predict who survives — the best-suited pass on their traits, so helpful ones spread.
- Adaptation Over TimeGrades 3–6Predict the fit — over many generations, species develop features that suit their home.
- Animal ClassificationGrades 3–6Predict the group — fur and milk mean mammal, feathers mean bird, scales and gills mean fish.
- What Is a Species?Grades 3–6Predict same species or not — a group that can breed and have young like themselves.
- ExtinctionGrades 3–6Predict extinct or endangered — gone forever, versus just a few left but hanging on.
- The Fossil RecordGrades 4–7Predict older or younger — deeper rock layers hold older fossils and life’s long story.
Making Electricity
- Power PlantsGrades 4–7Predict the source — most plants spin a turbine and generator; the fuel is what differs.
- Solar PowerGrades 3–6Predict the output — panels turn sunlight straight into electricity; bright sun makes more.
- HydropowerGrades 3–6Predict the flow — falling water spins a turbine; more water or a higher drop makes more.
- BatteriesGrades 3–6Predict the charge — a battery stores chemical energy and releases it as electricity.
- The Electricity GridGrades 4–7Predict the path — power travels from the plant along wires and transformers to your home.
Motion & Forces
- AccelerationGrades 4–7Predict the change — speeding up, slowing down or turning all count as acceleration.
- MomentumGrades 5–8Predict the hit — heavier or faster things carry more momentum and are harder to stop.
- Action & ReactionGrades 4–7Predict the push back — every push has an equal, opposite push in return.
- Circular MotionGrades 5–8Predict the pull — a thing moving in a circle is pulled to the center; let go and it flies straight.
- Terminal VelocityGrades 4–7Predict the top speed — a falling thing stops speeding up when air resistance balances gravity.
Waves & Vibrations
- What Is a Wave?Grades 3–6Predict what counts as a wave — a traveling disturbance that carries energy, not matter.
- Amplitude & EnergyGrades 4–7Predict the energy — a taller wave carries more; louder sound, bigger splash.
- Wavelength & FrequencyGrades 4–7Predict the trade — crests close together mean high frequency and a short wavelength.
- How Ears HearGrades 3–6Predict the path — sound waves vibrate the eardrum, then signals travel to the brain.
- Light Is a WaveGrades 4–7Predict the spectrum — radio, visible color and X-rays are all light waves of different lengths.
- Waves Carry EnergyGrades 3–6Predict what moves — a wave carries energy from place to place, while the matter bobs in place.
Animal Kingdom
Light & Optics
- How Eyes SeeGrades 3–6Predict the path — the lens focuses light onto the retina, then the brain makes the picture.
- LensesGrades 4–7Predict the bend — a bulging lens focuses and magnifies; a caved-in one spreads light out.
- Mixing Light ColorsGrades 4–7Predict the mix — red, green and blue light add up to white, unlike mixing paint.
- Why the Sky Is BlueGrades 4–7Predict the color — air scatters blue light across the sky, and red at sunset.
- How Cameras WorkGrades 3–6Predict the image — a lens focuses light onto a sensor, like a mechanical eye.
Chemistry Lab
- The Periodic TableGrades 5–8Predict the spot — all the elements are arranged by their properties, metals to non-metals.
- ElementsGrades 4–7Predict pure or not — an element is made of just one kind of atom, with its own symbol.
- Metals & Non-metalsGrades 4–7Predict the property — metals are shiny and conduct; non-metals are dull and insulate.
- GasesGrades 3–6Predict the behavior — a gas spreads to fill any container and can be squeezed smaller.
- CrystalsGrades 3–6Predict the pattern — atoms line up in a repeating grid, giving crystals their flat faces.
- Chemical FormulasGrades 5–8Predict the atoms — a formula like H₂O tells you which atoms and how many.
Body Systems
- The KidneysGrades 3–6Predict the job — the kidneys filter waste from the blood and make urine.
- ReflexesGrades 3–6Predict reflex or not — automatic, super-fast reactions that protect you without thinking.
- BloodGrades 4–7Predict the job — red cells carry oxygen, white cells fight germs, platelets clot a cut.
- The LiverGrades 4–7Predict the job — the liver cleans the blood of toxins and helps process your food.
- Body SystemsGrades 4–7Predict the system — heart and vessels circulate, lungs breathe, and they all work together.
Plate Tectonics
- Plate TectonicsGrades 4–7Predict the motion — Earth’s crust is broken into giant plates that slowly drift on the mantle.
- Continental DriftGrades 4–7Predict the past — the continents were once one landmass, Pangaea, and have drifted apart.
- How Mountains FormGrades 3–6Predict the rise — colliding plates crumple the crust upward into mountain ranges.
- Faults & EarthquakesGrades 4–7Predict the slip — stress builds where plates grind, then a sudden slip shakes the ground.
- Seafloor SpreadingGrades 5–8Predict the new crust — magma rises at mid-ocean ridges and spreads the seafloor outward.
- Hotspots & GeysersGrades 3–6Predict the heat — underground hot rock builds hotspot islands, geysers and hot springs.
Science Skills
- The Scientific MethodGrades 3–6Predict the step — ask, guess a hypothesis, experiment, observe, then conclude.
- Variables & Fair TestsGrades 4–7Predict a fair test — change one thing at a time and keep everything else the same.
- Reading GraphsGrades 3–6Predict the value — read bars and lines to answer questions and spot the trend.
Common Questions
What science do kids learn in grade 6?
These 139 grade 6 science games cover Forces & Motion, Simple Machines, Matter, Electricity, Light, Sound, Heat, Earth & Space, Life Science, Human Body, Chemistry, Energy, Weather, Ecosystems, Space & Astronomy, Plant Science, Geology, Cells & Microbiology, Health & the Body, Environment & Climate, Oceans & Marine Life, Extreme Weather & Sky, Space Exploration, Genetics & Heredity, Evolution & Classification, Making Electricity, Motion & Forces, Waves & Vibrations, Animal Kingdom, Light & Optics, Chemistry Lab, Body Systems, Plate Tectonics and Science Skills. Each game isolates one big idea, such as why a heavy and a light object fall together or what makes a circuit light a bulb.
How do the predict-observe-explain games work?
The child first predicts what will happen, then watches the real thing play out, then reads a short explanation of why. Checking a guess against the result is what corrects common misconceptions, and it takes only a minute or two per round.
Are these grade 6 science games free?
Yes. Every game is free with no ads, no in-app purchases and no sign-up, and runs in any browser on a phone, tablet or computer.
How long should my child play each day?
Ten to fifteen minutes is plenty. One or two games per sitting, ideally followed by a quick chat about what surprised them or a real-life experiment at home, helps the idea stick.
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